So you need valve seals done then...

How long have you owned the car? Valve seals is a common issue, what i would take into account is that if youve been keeping it up properly or had it for longer, its better to just do the seals ans invest in the engine that you know. You wont know a used engines history, the owner may have changed oil every 20k miles and will have more issues down the road.

Not only that the labor on pulling and installing a new motor will be more then this.. Im not sure which method your mechanic is doing and if he is pulling the heads or not, but it can be done now with the valve seal tool from AGA which simplifies it even more by just removing valve covers/intake and doing the seals that way. Valve cover gaskets and seals cost for parts is total beans $.

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2006 X5 4.8is Fully Loaded